781638053 has 12 divisors (see below), whose sum is σ = 962738892. Its totient is φ = 630564480.

The previous prime is 781638043. The next prime is 781638097. The reversal of 781638053 is 350836187.

It can be written as a sum of positive squares in 2 ways, for example, as 582884449 + 198753604 = 24143^2 + 14098^2 .

It is not a de Polignac number, because 781638053 - 2⁴ = 781638037 is a prime.

It is a super-2 number, since 2×781638053² = 1221916091795261618, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781638053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781638023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468338 + ... + 470003.

It is an arithmetic number, because the mean of its divisors is an integer number (80228241).

Almost surely, 2^781638053 is an apocalyptic number.

It is an amenable number.

781638053 is a deficient number, since it is larger than the sum of its proper divisors (181100839).

781638053 is a wasteful number, since it uses less digits than its factorization.

781638053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938372 (or 938365 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 781638053 is about 27957.7905600568. The cubic root of 781638053 is about 921.1603400300.

The spelling of 781638053 in words is "seven hundred eighty-one million, six hundred thirty-eight thousand, fifty-three".